The FBI defines terrorism, domestic or international, as the unlawful use of force or violence against persons or property to intimidate or coerce a Government or civilian population in furtherance of political or social objectives. The FBI is the lead agency for operational response to domestic terrorism and also has responsibility for some terrorist actions against Americans overseas. The FBI has a dual mission to prevent and react to terrorist violence. It does this by collecting and disseminating information, planning, and investigation. The FBI is also involved in crisis and special events management, research (trend analysis, threat assessment), training, hostage negotiation, and interagency coordination and cooperation.